EP0512133B1 - Procédé d'accord automatique par balayage de porteuses son pour télévision par satellites - Google Patents

Procédé d'accord automatique par balayage de porteuses son pour télévision par satellites Download PDF

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Publication number
EP0512133B1
EP0512133B1 EP91107238A EP91107238A EP0512133B1 EP 0512133 B1 EP0512133 B1 EP 0512133B1 EP 91107238 A EP91107238 A EP 91107238A EP 91107238 A EP91107238 A EP 91107238A EP 0512133 B1 EP0512133 B1 EP 0512133B1
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EP
European Patent Office
Prior art keywords
sound
frequency
tuning
search
display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91107238A
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German (de)
English (en)
Other versions
EP0512133A1 (fr
Inventor
Thomas Dipl.-Ing. Hilpert
Stefan Dipl.-Ing. Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Micronas GmbH
Original Assignee
Deutsche ITT Industries GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche ITT Industries GmbH filed Critical Deutsche ITT Industries GmbH
Priority to DE59108456T priority Critical patent/DE59108456D1/de
Priority to EP91107238A priority patent/EP0512133B1/fr
Priority to KR1019920007219A priority patent/KR100210975B1/ko
Priority to US07/877,565 priority patent/US5268712A/en
Priority to JP4111857A priority patent/JP3004806B2/ja
Publication of EP0512133A1 publication Critical patent/EP0512133A1/fr
Application granted granted Critical
Publication of EP0512133B1 publication Critical patent/EP0512133B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/32—Automatic scanning over a band of frequencies with simultaneous display of received frequencies, e.g. panoramic receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
    • H04N5/607—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals for more than one sound signal, e.g. stereo, multilanguages
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/06—Systems for the simultaneous transmission of one television signal, i.e. both picture and sound, by more than one carrier

Definitions

  • the invention relates to a method for frequency tuning of the frequency-modulated sound carriers of multi-tone transmission standards in a television receiver suitable for TV satellite reception using a digital sound channel processing device with a quadrature mixer, a channel filter, a demodulator, a sound stage and a central control device, which by means of a the frequency programmable digital generator tunes the quadrature mixer, cf. the preamble of claim 1.
  • the invention characterized in the claims, which essentially consists in the fact that the use of a search method for the unknown sound carriers means that knowledge of their position within the sound IF range can be dispensed with.
  • the FM demodulator is switched to AM demodulation and the pass band bandwidth of the FM channel filter is narrowed to such an extent that the FM center frequency can be detected via an amplitude evaluation.
  • the determination of the mean amplitude density serves as a criterion, e.g. via an average effective value measurement, in each search step.
  • the relative maximum is determined from the comparison of the mean amplitude density of adjacent search intervals and the associated search interval forms the sought FM center frequency.
  • a step size of, for example, 10 kHz has proven to be expedient. It should be noted here that with FM modulation the carrier amplitude remains constant and that an FM center frequency determination is only possible via a frequency-related amplitude density measurement.
  • the existing sound channel processing circuit is a digital circuit that processes data, because then the frequency and behavior of the filters and sound stages can be controlled by changing the supplied coefficients.
  • Fig. 1 shows schematically the example of a complete satellite television channel in baseband with the video part up to about 5 MHz and the audio IF range above it up to about 9 MHz.
  • the main carrier h Immediately following the video frequency range is the main carrier h at 6.5 MHz, which is generally larger in amplitude than the other sound carriers and generally contains a mono signal.
  • the sound carriers above are referred to as subcarriers u and contain either the stereo signal part or different languages.
  • the individual subcarriers u are spaced apart by 180 kHz.
  • Fig. 2 shows the block diagram of a circuit arrangement for performing the search method.
  • the block diagram only contains circuit parts that originate from the existing audio signal processing or that previously served other functions.
  • the input signal si is an analog signal which comprises at least the entire audio signal range, which in the assumed example of FIG. 1 ranges from approximately 5.5 MHz to 9.2 MHz.
  • the analog signal si is digitized using an analog-digital converter ad and a system clock cl and fed to the input of a quadrature mixer m. This is designed as a double mixer because two FM sound carriers usually have to be demodulated for stereo playback.
  • the double mixer m is therefore fed from two digital generators g1, g2, each of which a pair of beat signals s, c; s', c control device st is set via a first and second data word f1, f2.
  • a periodically overflowing accumulator which adds the respective data word f1, f2 to its previous content with each system clock cl and controls a read-only memory table with a number of most significant digits of the accumulator content, which correspond to the current phase value between 0 degrees and 360 degrees reads out the associated sine values s and cosine values c of the beat signal pair and feeds them to the data inputs of the quadrature mixer.
  • the middle period of the overflowing accumulator corresponds exactly to the desired beat frequency.
  • the double quadrature mixer m supplies two quadrature signal pairs to a double-channel filter F 'as output signals, with only the channel filter F which is coupled to the first digital generator g1 being of interest for further consideration of the search method.
  • the bandwidth of this channel filter F which lies between 130 kHz and 380 kHz during normal FM operation, is switched over by the central control device st during the search via corresponding search coefficients Ks to a bandwidth between 20 kHz and 50 kHz.
  • the switchability of this channel filter F to different bandwidths is already predetermined by the existing audio channel processing device T, the bandwidth being adapted to different operating conditions via different operating coefficients Kt, depending on whether a main or a subcarrier h, u has to be filtered out.
  • the output signal of this channel filter F is a quadrature signal pair consisting of an in-phase signal i and a quadrature phase signal q.
  • these two signals i, q are shown schematically in a Cartesian coordinate system x, y.
  • the present demodulator D makes use of this method in the sound channel processing circuit T.
  • the demodulator D contains a phase converter P, which forms the phase angle p from the in-phase signal i and the quadrature phase signal q and additionally outputs the amount b of the resulting signal R - this corresponds to an FM and AM demodulation apart from the differentiation.
  • phase converters P generally use iteration methods to determine the phase and the amount, the best known method being the "Cordic method”.
  • Other phase converters P use stored table values or use a simplified series development.
  • the phase angle p in FM demodulation feeds a differentiator Di, the output of which is connected to the input FM of an electronic switch sw.
  • the electronic switch sw is switched so that its input AM is fed directly with the amount b.
  • the tone stage t is connected to the adaptive deemphasis and further filter devices, which are controlled by the central control device st via tone step coefficients Kc.
  • the digital output signal of the sound stage t is then converted back via a digital-to-analog converter and one Speaker group l supplied.
  • the tone level t is of course muted during the search process.
  • a level filter PF which is fed with the amplitude values of the tone stage, it is possible to determine an average amplitude level of the demodulated audio signal, with a low filter time constant of approx. 15 Hz (or 1 Hz to 300 Hz).
  • an extreme value detector ex determines the relative amplitude maximum from neighboring measuring intervals. If there are several relative maxima, then an evaluation device w determines, by means of the associated frequency of the superimposed signal pair s, c and by means of the absolute amplitude, which of the main carriers h and which are the subcarriers u and which operating coefficients Kt and which tone step coefficients Kc are to be set when the search is finished .
  • the extreme value determination and the evaluation can be carried out using a simple sequence program as software in the central control device st. To determine the extreme value, only the differences between adjacent mean amplitudes and the reversal point of the sign have to be formed be determined. The reversal point defines the relative amplitude maximum.
  • the fixed value table of the evaluation device w also contains data which are fed to an on-screen display processor DP which is usually used for teletext display or which enables high-resolution graphics on a screen bs via a pixel controller.
  • the screen bs of the television receiver represents an extremely effective display device S, which can additionally be combined with a menu control.
  • the individual commands are supplied to the television receiver via a remote control transmitter, which internally passes them on to the central control device st via an instruction bus.
  • 6 shows a possible representation of the existing sound carriers as an example, namely as a bar diagram with the associated sound carrier center frequencies on the horizontal axis and with a numbering of the individual sound carriers above the associated bar.
  • the main carrier with the code number 1 is clearly distinguished from the subcarriers 2 to 6.
  • the lower display area prompts you to select a carrier code. If the selected carrier allows stereo operation, the next menu request could be: "Mono 1 - Stereo 2" etc.
  • FIG. 4 schematically shows a first example of the method steps for implementation in a first flow chart the search for the invention.
  • the flowchart begins with the search start trigger 1, which can be activated, for example, via the remote control device.
  • the audio channel is muted, and in step 3 the search coefficients Ks for the channel filter F are set, whereby the bandwidth is reduced to the search value.
  • the demodulator D is switched to AM demodulation. In the circuit configuration according to FIG. 2, only the electronic switch sw has to be switched to the switching position AM.
  • step 5 the frequency of the beat signal pair s, c is increased by 10 kHz.
  • the central control device st changes the value of the first data word f1 by an amount which corresponds to the desired search step.
  • step 7 the decision must be made as to whether or not the mean effective signal amplitude represents a relative maximum. If it is not a relative maximum, the beat frequency is increased by a further step.
  • the display device can be a control lamp or an alphanumeric display. It remains to be seen whether the found sound carrier is the desired sound carrier determined by the operating step 10 with which the audio reproduction of this sound carrier is activated. If this sound carrier is not desired, which is determined by "listening in”, then the search process for the next sound carrier is continued by triggering start step 1.
  • step 11 the demodulator D is switched over to FM demodulation; and step 13 finally unmutes.
  • Fig. 5 shows schematically as a functional diagram a second search method according to the invention, which enables greater ease of use.
  • the same functional units are given the same reference numerals in FIGS. 4 and 5 and therefore do not need to be explained again in more detail.
  • the search run is carried out from a starting frequency fo, which is approximately 5 MHz, without interruption over the entire carrier ranges up to approximately 9 MHz.
  • a starting frequency fo which is approximately 5 MHz
  • these carriers are displayed together with a menu control on the screen of the television receiver and the desired sound carriers are selected.
  • the functional diagram of FIG. 5 begins with the known steps 1 to 4, which are then followed by the new step 4.1, with which the starting frequency fo is set.
  • the search frequency f is increased by one frequency step in each measuring interval in step 5. This frequency increase will last continued until the check in step 5.1 shows that the maximum frequency fmax is reached at approximately 9 MHz.
  • the display on the screen is supplemented in step 9.2 by a menu request, which enables a targeted selection from the schematically represented sound carriers.
  • FIG. 6 An example of such a combined representation is shown in FIG. 6.
  • the answer to the menu request takes place in step 10.1, for example by entering a code number for the sound carrier to be selected.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Circuits Of Receivers In General (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Television Receiver Circuits (AREA)
  • Television Systems (AREA)

Claims (10)

  1. Procédé d'accord de fréquence des porteuses audio modulées en fréquence de standards de communication multiphoniques dans un récepteur de télévision convenant à la réception TV par satellites en utilisant un dispositif de traitement numérique du canal audio (T) comportant un mélangeur en quadrature (m), un filtre de canal (F), un démodulateur (D), un étage audio (t) et un dispositif de commande central (st), qui fait varier l'accord du mélangeur en quadrature au moyen d'un générateur numérique (g1) programmable en fréquence, caractérisé par les caractéristiques suivantes :
    - l'accord de fréquence se fait sous la forme d'une commande de balayage automatique, dans laquelle deux signaux de superposition (s, c) sont modifiés en fréquence par paliers et chaque incrément de fréquence de balayage représente un intervalle de mesure,
    - la plage passante du filtre de canal (F) est commutée par le dispositif de commande central (st) sur une largeur de bande, qui se situe entre deux fois et cinq fois la largeur de bande de l'incrément de fréquence de balayage,
    - le démodulateur (D) raccordé à la sortie du filtre de canal (F) est commuté par le dispositif de commande central (st) sur une démodulation d'amplitude,
    - par détermination de valeurs extrêmes, on détermine, à partir d'intervalles de mesure voisins, la valeur maximale relative de l'amplitude et cette valeur est acheminée à un dispositif d'exploitation (w) et à un dispositif d'affichage (S), l'affectation à l'incrément de fréquence de balayage concerné restant maintenue, au moyen du dispositif de commande central (st), pour le dispositif d'exploitation et d'affichage.
  2. Procédé selon la revendication 1, caractérisé en ce que le démodulateur (D) contient une convertisseur de phase (P) et un différenciateur (Di), qui déterminent, à partir du signal en phase et du signal en quadrature de phase (i, q) du mélangeur en quadrature (m), la phase respective (p) et/ou la somme respective (b) du signal obtenu (R) et délivrent ces valeurs comme signaux de sortie.
  3. Procédé selon la revendication 1, caractérisé en ce que le dispositif d'affichage (S) effectue une représentation graphique ou alphanumérique sur l'écran (bs) du récepteur de télévision.
  4. Procédé selon la revendication 3, caractérisé en ce que la représentation sur l'écran (bs) est combinée à une représentation de menu et à une commande de menu, ce qui permet à l'observateur de choisir le ou les porteuses audio de télévision offertes (h, u).
  5. Procédé selon la revendication 4, caractérisé en ce que, sur l'écran (bs), les porteuses audio captées (h, u) sont représentées schématiquement sous la forme d'un diagramme de barres vis-à-vis de la fréquence et en ce que les porteuses audio souhaitées (h, u) sont choisies par l'opérateur via un chiffre ou un symbole d'identification à l'aide de la commande de menu.
  6. Procédé selon la revendication 4, caractérisé en ce que la représentation sur l'écran (bs) se fait par une commande de pixels de haute résolution.
  7. Procédé selon la revendication 6, caractérisé en ce que la commande de pixels de haute résolution se fait à l'aide d'un processeur d'affichage sur écran (DP) orienté par pixels, présent dans le récepteur de télévision.
  8. Procédé selon la revendication 1, caractérisé en ce que la valeur d'amplitude est acheminée à un filtre de niveau (PF), qui fait partie d'un dispositif de filtrage adaptatif présent dans l'étage audio (t) et en ce que le signal de sortie de ce filtre de niveau est acheminé, via un bus de données (bu), au dispositif de commande central (st), qui sert également de détecteur de valeurs extrêmes (ex) et de dispositif d'exploitation (w).
  9. Procédé selon la revendication 8, caractérisé en ce que le filtre de niveau (PF) est un dispositif de valeurs quadratiques moyennes avec une constante de temps entre 1 et 300 Hz.
  10. Procédé selon la revendication 1, caractérisé en ce que, à partir du rapport des valeurs d'amplitude absolues, qui ont été déterminées par la détermination de valeurs extrêmes, le dispositif d'exploitation (w) distingue entre les porteuses principales et les sous-porteuses (h, u) et, à la fin du balayage, au moyen du dispositif de commande central (st), on règle automatiquement la largeur de bande FM requise pour le filtre de canal (F) et la désaccentuation requise dans l'étage audio (t) via des coefficients d'exploitation ou des coefficients de l'étage audio (Kt, Kc).
EP91107238A 1991-05-03 1991-05-03 Procédé d'accord automatique par balayage de porteuses son pour télévision par satellites Expired - Lifetime EP0512133B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE59108456T DE59108456D1 (de) 1991-05-03 1991-05-03 Verfahren zur automatischen Suchlaufabstimmung von Satelliten-Fernsehtonträgern
EP91107238A EP0512133B1 (fr) 1991-05-03 1991-05-03 Procédé d'accord automatique par balayage de porteuses son pour télévision par satellites
KR1019920007219A KR100210975B1 (ko) 1991-05-03 1992-04-29 위성 텔레비젼 음성 반송파를 자동탐색 동조하는 방법
US07/877,565 US5268712A (en) 1991-05-03 1992-04-30 Apparatus and method for search tuning of satellite television sound carriers
JP4111857A JP3004806B2 (ja) 1991-05-03 1992-04-30 衛星およびテレビジョン音響キャリアの自動探索同調方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP91107238A EP0512133B1 (fr) 1991-05-03 1991-05-03 Procédé d'accord automatique par balayage de porteuses son pour télévision par satellites

Publications (2)

Publication Number Publication Date
EP0512133A1 EP0512133A1 (fr) 1992-11-11
EP0512133B1 true EP0512133B1 (fr) 1997-01-02

Family

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Family Applications (1)

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EP91107238A Expired - Lifetime EP0512133B1 (fr) 1991-05-03 1991-05-03 Procédé d'accord automatique par balayage de porteuses son pour télévision par satellites

Country Status (5)

Country Link
US (1) US5268712A (fr)
EP (1) EP0512133B1 (fr)
JP (1) JP3004806B2 (fr)
KR (1) KR100210975B1 (fr)
DE (1) DE59108456D1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5842119A (en) * 1993-02-05 1998-11-24 Emerson; Harry Edwin Radio scanner and display system
US5613232A (en) * 1993-03-12 1997-03-18 Alinco Incorporated Receiver apparatus comprising display means for displaying signal strengths of signals having a plurality of frequencies, and display apparatus for use in receiver apparatus
EP0783810A4 (fr) * 1994-08-04 2001-03-07 Harry Edwin Emerson Systeme de reception radio a balayage et d'affichage
DE59611437D1 (de) * 1996-02-27 2007-08-23 Micronas Gmbh Schaltung zur Dekodierung einer Zusatzinformation in einer Rundfunkübertragung
US6021268A (en) * 1997-08-21 2000-02-01 Analytical Graphics, Inc. Method and apparatus for modeling receiver bandwidth for telecommunications analysis
US6473597B1 (en) 2000-04-12 2002-10-29 Thomas M. Johnson Method and apparatus for modeling transmitter bandwidth for telecommunications analysis
US7024169B2 (en) * 2002-01-25 2006-04-04 Qualcomm Incorporated AMPS receiver using a zero-IF architecture
CN1294744C (zh) * 2004-07-30 2007-01-10 上海广电（集团）有限公司中央研究院 在不同电视机之间实现频道转换一致的方法及设备
US7903763B2 (en) * 2007-01-31 2011-03-08 Stmicroelectronics S.R.L. Bandwidth selection for FM applications
JPWO2017061247A1 (ja) * 2015-10-09 2018-07-26 ソニー株式会社 バスシステムおよび通信装置

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
DE3033496C2 (de) * 1980-09-05 1985-07-25 Casma di V. Marinoni & Figli, Magenta In Offenstellung verrastbares Türschließergestänge
EP0208425A3 (fr) * 1985-06-13 1988-01-13 Devon County Council Transmission par la sous-porteuse de signaux de télévision
US4698670A (en) * 1986-07-14 1987-10-06 Westinghouse Electric Corp. Cable stereo apparatus
DE3850773D1 (de) * 1988-08-06 1994-08-25 Itt Ind Gmbh Deutsche Fernbedienungssystem.
EP0356555B1 (fr) * 1988-08-31 1993-10-27 Siemens Aktiengesellschaft Procédé et montage de circuit pour déterminer la présence ou non d'au moins une fréquence d'une valeur connue dans un signal d'entrée composé de plusieurs fréquences
DE3843451A1 (de) * 1988-12-23 1990-06-28 Bosch Gmbh Robert Satelliten-fernseh- und -tonrundfunkuebertragungssystem
GB8928551D0 (en) * 1989-12-18 1990-02-21 Thomson Consumer Electronics Band indicative segmented tuning bar display
KR970001625B1 (ko) * 1990-06-30 1997-02-11 삼성전자 주식회사 Nicam 언어 다중 방송 탐색 장치 및 그 방법

Also Published As

Publication number Publication date
JP3004806B2 (ja) 2000-01-31
DE59108456D1 (de) 1997-02-13
JPH05183908A (ja) 1993-07-23
KR100210975B1 (ko) 1999-07-15
EP0512133A1 (fr) 1992-11-11
US5268712A (en) 1993-12-07
KR920022905A (ko) 1992-12-19

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